Mortising machine



G. W. CAMPBELL. MORTISING MACHINE.

APPLICATION FILED nmao, 1920.

Patented May 9, 1922.

UNITED STATES PATENT OFFICE.

GEORGE W. CAMPBELL, OF COLUNFBUS, OHIO.

. MORTISING MACHINE.

To all whom it may concern:

Be it known that Gnonon W.

Columbus in the county of Franklin and State of hi0, have invented acertain new and useful Improvement. in Mortising Machines, of which the.following is a specification.

The present invention relates to the kind ofmachine shown and describedin the patent issued to me 1,289,114, and has for its object to simplifyand cheapen the construction of such machine and promote the ease andefiiciency of its operation. he invention is embodied in the exampleherein particularly shown'and described, the

features of? novelty beingfinally claimed.

In the accompanying drawing, Figure 1 is a side elevation of the machineaccording. to my presentimprovements.

Fig. 2 is a sectional (lBtaIlVlGW on a large scale of means clutchshifting lever.

1g. 3 is a sectional detail of the tool and tool carrier feedingelement.

. I 4 is a partial detail in side view of the shiftable bar. i

ig. 5 is a view looking at the right hand side of what is shown in Fig.4: with the means for compressing the springs of the clutch shiftinglever added.

The cut re erred to includes guide rods 1 and 2 connected together atone end by a handle portion 3 and at the otherend by a cross bar 4 the uper and lower ends of which are provided with suitable clamps 5 forattaching the machine to the door or other object} to be ,mortised. Thecarriage for the operating parts is slidably mounted upon the guide rods1 and 2 and consists of side pieces 6 and 7, a rear connectlngpiece 11,forward connecting piece 9 and Intel" mediate cross piece .8, thecarriage being provided with laterally extending bosses 12 that aresleeved upon the guide rods 1 and 2.

Journaled in thecross piece 11.. is a shaft 14to which is connected themain operating wheel 15, and pivoted upon said shaft l4; is anoscillatin arm 17 carrying the tool holder 18. T e tool shaft 19 ispinned at 18 in the holder 18 so as to becapable of rotation therein.The tool 19 is removably screwed into the forward end of the tool shaft.The forward end of the oscillating arm 17 is Specification of LettersPatent.

December 31, 1918 No..

1 threaded portion of the sore actuating and latching the resent machineas in my former pat- Patented May 9, 1922. 434,022.

made with a housing 17 within whichis located a pinion 2O pinned to thetool shaft.

The pinion 20 is 111 mesh with the teet-h 2l ways 27 integrally formedwith the tool holder 17.

Loosely mounted upon an un It 23 are beveled gears 28 and 29 to saidunthreaded portion of the screw between these gears is a clutch member30 arranged to be shifted along the spline so as to be thrown intoengagement with either one of the gears as in my former patent referredto. A beveled pinion 35 is in mesh with both the gears 28 and 29 and hasits shaft journaled in the frame of the carrier, the opposite end of theshaft being provided with a pinion 36 (shown in dotted lines in Fig. 1)in mesh with the internal gear teeth 37 operating wheel so that as saidwheel is operatcd the gears 28 and 29 will be operated in oppositedirections. to the carrier frame at 40 is a shiiting yokelike lever 39,one arm ll of. which engages the grooved clutch collar 30. Saidyoke-like lever carries a rod upon which slides a spool 1-7 andinterposed between said spool and the ends of the yoke-like lever arecoil sprin t8 and 49 either of which is adapted to be placed undercompression when the spool is shifted against it. Tl

initially tilted 1 so upon the compression of one of the springs 4-8 andhe movement of the spool 47 which is connected with and actuated by afork 50 on a beveled projection 51 on tl'ieshiftable bar 57. Means forpreventing the oscillation of the lever 39 until the proper spring isfully compressed con sists of two pivoted latches 52 and 53 each ofwhich is provided with shoulder 54 and a beveled portion 55. When the,lever is shifted to one position the shoulder on one of the latches willengage the projection 56 and retain the lever in its shifted position.The lever 39 will ordinarily be held in this position until extremelimit of its movement, but will be finally released by the beveledprojection 51 operating wheel 15 so that Pivotally connected theshifting device 57 is near the "39 and after the apices pass gageduntilthe yoke coming in contact with the inclined portion of the latch whichforces the latch out of engagement with the projection on the leverafter the corresponding spring has been placed under compression by themovement of the bar 57 The spring then quickly shifts the lever so as'tothrow the clutch 3O fromone gear to the other, the latch being at thesame time returned to normal latching position by a spring (53. Theshifting of the bar 57 to accomplish this begins to take place near theend or each oscillatory movement of the tool holder as in my formerpatent. But in the present instance the side of the yoke-like lever isprovided with a beveled projection 89* extending at right angles to theplane of its oscillation and upon the frame is a socket member 7 havinga spring held plunger pin 80 beveled at its end to co-act -with thebeveled projection 39. When aspring 48 or 49 is compressed the plungerpin 80 rides up one side of the pin the opposite side acts to throw theyoke to full clutching position and holds the clutch securely enlever issimilarly actuated in the opposite direction. The slidable bar 57 as inmy former patent has rotat- P sleeves 59 and 60 ably mounted thereon ascrew 58 one half of which is provided with right hand threads and theother with left-hand threads. Threaded on each half of this screw areeach of which has a pin as shown at 61 that projects through a slot eX-tending lengthwise of the bar 57. The screw 58 has finger piece 62 bywhich it may be turned so as to simultaneously and uniformly adjust thepins 61 to or from the 7 '57 the fork 50 will center of the machine,said pins being held from turning with the screw as in'my former patentreferred to. WVhen the tool holder strikes one of the pins 61 and movesthe bar move the spool l? placing one of the springs 18 or 49 undercompression and then by reason of the beveled projection 51 on said barfinally release the latch which is holding the lever 39 and therei bypermit the shifting of this lever by the worm teeth 65 engaged by springwhich has'been placed under compression. a

As is usual in machines of this character, means are provided forfeeding the tool into the mortise at the end of each oscillatorymovement of the tool carrier. In the present machine this isaccomplished as follows. "The guiderail 1 is a worm 66 mounted on aneccentric sleeve 67 havinga finger piece 67, said worm havmg at itslower end a ratchet 69. Secured to the shiftside of this ratchet wheelare reversely acting spring pawls 70 which alternately engage theratchet wheel at the end of each oscillatory movement of the toolcarrier and thereby turn the worm formed with ment with the rack byturning the eccentric sleeve with the finger piece 67 against theholding spring 68 so that the worm can pass freely over the worm rack,after which the carrier may be readily slid along the guides 1 and 2.The spring 68 is designed to hold the worm yieldingly either in or outof engagement with the rack.

The central portion of the cross bar 8 which in'the present instance isplaced for ward of the bearing 14 is formed with a curved groove 8 andthe rear end of the tool holder is provided with a pin 8 to enter saidgroove. This construction allows the tool holder and tool a longitudinalmovement relative the other parts, this movement being determined by thecurvature of the groove 8 of the bar 8 as the pin 8 travels thereinduring the oscillatory movement, the curvature of this groove being suchas to cause the cutting end of the tool to travel in a substantiallystraight line throughout the entire length of the mortise. By thepresent construction both frames are greatly shortened and the necessityfor providing ball or roller bearings to prevent binding where the shaftcrosses the main axis of oscillation is avoided.

From the foregoing it will be observed that, except as to the operationof those details by which the present construction is distinguished fromthe construction of my former patent the operation generally is thesame. That is to say by turning the large main operating wheel in onedirection the tool or bit is turned and at the same time automaticallyswung back and forth to cut an elongated mortise to the depth desiredand permitted by the machine.

The forms of the parts can be changed without departing from the gist ofthe invention claimed.

What I claim is:

1. In a mortising machine, a main frame, an oscillatory tool carried bysaid frame, a screw having an operative connection with said tool, meansfor rotating said screw in opposite directions comprising a shiftableclutch, a pivoted shifting lever for said clutch, a pair of springscarried by said lever, a latch for said lever in each of its positions,a slidable bar operated by the oscillations of the tool adapted tocompress one or the other of said springs for initially shifting saidlever, a beveled member on said shifting lever extending from the sidepin on the main frame shifting lever to finally thereof at right anglesto the plane of its oscillation,

and a beveled spring-actuated of the machine cooperating with saidbeveled member on the shift said clutch into operative position.

In a mortising machine, the combination with a main frame, and a slidingframe carrying an oscillated tool, of means for feeding the slidingframecomprising a rack member formed on said frame, a Worm on the slidingframe engaging said rack, a bar sliding with the oscillations of thetool, and means actuated by the sliding bar for intermittently rotatingsaid wor 3. In a mortislng machine, an oscillating support, a toolivotally connected to said support to oscil ate therewith and thereon,

the connection being such as to permit an axial movement of said toolrelative thereto, mechanism for oscillating said tool, the connectionbetween the tool and mechanism being such as to permit pivotal and axialsaid tool relative thereto, a in advance of the center of oscillation ofthe tool support and means associated with the tool for engaging saidguide, said guide and engaging means adapted to cause the operative endof the tool to oscillate in substantially a straight line.

GEORGE W. CAMPBELL.

